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Finding the Fourth Proportional to 815.82, 1,126.26 and 628.90

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Solution

The fourth proportional to 815.82, 1,126.26 and 628.90 is: 868.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.82 : 1,126.26 = 628.90 : x
  2. Step 2: Convert to fraction form
    815.82/1,126.26 = 628.90/x
  3. Step 3: Cross multiply
    815.82x = 1,126.26 × 628.90
  4. Step 4: Simplify right side
    815.82x = 708,302.10
  5. Step 5: Solve for x
    x = 708,302.10/815.82
  6. Step 6: Final answer
    x = 868.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.